<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../vue.js"></script>
</head>

<body>
  <div id="app">
    <button @click="forceUpdate">强制更新</button>
    <button @click="update1">修改数组的某一个值</button>
    <button @click="update2">使用变更方法修改数组</button>
    <button @click="update3">使用非变更方法修改数组</button>
    <ul>
      <li v-for="item in names">{{item}}</li>
    </ul>
  </div>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#app",
      data() {
        return {
          names: ["wucy", "zhangsan", "lily"]
        }
      },
      methods: {
        forceUpdate() {
          this.$forceUpdate()
        },
        update1() {
          /* js的限制,无法检测数组中某个值的变化,所以直接修改数组视图不会更新 */
          // this.names[1] = "libo";
          // this.names.length = 0;
        },
        update2() {
          /* Vue 将被侦听的数组的变更方法进行了包裹，所以它们也将会触发视图更新 */
          // this.names.push("huge")
          this.names.sort()
        },
        update3() {
          this.names = this.names.filter(item => {
            return item !== "lily"
          })
        }

      }
    })
  </script>
</body>

</html>